Malicious PDF — malware analysis report

Static analysis result for SHA-256 798ffd0e1fe2f353…

MALICIOUS

PDF

89.9 KB Created: 2021-10-06 03:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b200e0a5557f72097842ad74e53b4b42 SHA-1: bd66457b1c8b4135dd363a3210ac99fa3b06ece7 SHA-256: 798ffd0e1fe2f35322ebdce082d238ed68e7d28636169dad7af22a2be08ff81e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to external PDF files, and a heuristic specifically flagged it as a payment redirection lure. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the structure and heuristics suggest the document is designed to trick users into downloading and potentially interacting with malicious content, likely for financial gain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fo6p01ugd64a69lfsjble9dsk1/7017769981.pdf In PDF document text
    • http://acril.ru/ufiles/files/vadasiniz.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915150073499.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/xaxipuzobid.pdfIn PDF document text
    • http://slsnn.ru/content/file/77424473355.pdfIn PDF document text
    • http://erdbau-rauch.at/49456627435.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wepowonopatugewe.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gotedofosemunipezijoram.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63298498934.pdfIn PDF document text
    • http://gensugroup.com/upload/files/fexezuzofipa.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/desef.pdfIn PDF document text
    • https://andhimazhai.com/images/files/97121675060.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109220616509468.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/vawosuruvoviladulelisatu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16150501195b6c---nupifijudokobi.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/44066476236.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/47568679229.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/buliloriliw.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/denuwisuwarov.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/rafugupegexudoxigajele.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebd72c1b7f---7822014846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=writing+under+a+pen+namePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 20136 bytes
SHA-256: 6fc378714c6033577a879d47d2a2c09ae5baab54b66d5411afc6bccc8d460f08
font_02_sfnt_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 10496 bytes
SHA-256: 370b1195454c9846cbdeb6ecbbbee3e40d592227464741413b1853345ec4047d